1 /*- 2 * Copyright (c) 1997, 1998 3 * Nan Yang Computer Services Limited. All rights reserved. 4 * 5 * This software is distributed under the so-called ``Berkeley 6 * License'': 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Nan Yang Computer 19 * Services Limited. 20 * 4. Neither the name of the Company nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * This software is provided ``as is'', and any express or implied 25 * warranties, including, but not limited to, the implied warranties of 26 * merchantability and fitness for a particular purpose are disclaimed. 27 * In no event shall the company or contributors be liable for any 28 * direct, indirect, incidental, special, exemplary, or consequential 29 * damages (including, but not limited to, procurement of substitute 30 * goods or services; loss of use, data, or profits; or business 31 * interruption) however caused and on any theory of liability, whether 32 * in contract, strict liability, or tort (including negligence or 33 * otherwise) arising in any way out of the use of this software, even if 34 * advised of the possibility of such damage. 35 * 36 * $Id: vinumio.c,v 1.30 2000/05/10 23:23:30 grog Exp grog $ 37 * $FreeBSD: src/sys/dev/vinum/vinumio.c,v 1.52.2.6 2002/05/02 08:43:44 grog Exp $ 38 */ 39 40 #include "vinumhdr.h" 41 #include "request.h" 42 #include <vm/vm_zone.h> 43 #include <sys/nlookup.h> 44 45 static char *sappend(char *txt, char *s); 46 static int drivecmp(const void *va, const void *vb); 47 48 /* 49 * Open the device associated with the drive, and set drive's vp. 50 * Return an error number 51 */ 52 int 53 open_drive(struct drive *drive, struct proc *p, int verbose) 54 { 55 struct nlookupdata nd; 56 int error; 57 58 /* 59 * Fail if already open 60 */ 61 if (drive->flags & VF_OPEN) 62 return EBUSY; 63 64 if (rootdev) { 65 /* 66 * Open via filesystem (future) 67 */ 68 error = nlookup_init(&nd, drive->devicename, UIO_SYSSPACE, NLC_FOLLOW); 69 if (error) 70 return error; 71 error = vn_open(&nd, NULL, FREAD|FWRITE, 0); 72 drive->vp = nd.nl_open_vp; 73 nd.nl_open_vp = NULL; 74 nlookup_done(&nd); 75 } else { 76 /* 77 * Open via synthesized vnode backed by disk device 78 */ 79 error = vn_opendisk(drive->devicename, FREAD|FWRITE, &drive->vp); 80 if (error) 81 return error; 82 } 83 84 if (error == 0 && drive->vp == NULL) 85 error = ENODEV; 86 87 /* 88 * A huge amount of pollution all over vinum requires that our low 89 * level drive be a device. 90 */ 91 if (error == 0 && drive->vp->v_type != VCHR) { 92 vn_close(drive->vp, FREAD|FWRITE, NULL); 93 drive->vp = NULL; 94 error = ENODEV; 95 } 96 if (error) { 97 drive->state = drive_down; 98 if (verbose) { 99 log(LOG_WARNING, 100 "vinum open_drive %s: failed with error %d\n", 101 drive->devicename, error); 102 } 103 } else { 104 drive->dev = drive->vp->v_rdev; 105 drive->flags |= VF_OPEN; 106 } 107 drive->lasterror = error; 108 return error; 109 } 110 111 /* 112 * Set some variables in the drive struct 113 * in more convenient form. Return error indication 114 */ 115 int 116 set_drive_parms(struct drive *drive) 117 { 118 drive->blocksize = BLKDEV_IOSIZE; /* do we need this? */ 119 drive->secsperblock = drive->blocksize /* number of sectors per block */ 120 / drive->partinfo.media_blksize; 121 122 /* Now update the label part */ 123 bcopy(hostname, drive->label.sysname, VINUMHOSTNAMELEN); /* put in host name */ 124 getmicrotime(&drive->label.date_of_birth); /* and current time */ 125 drive->label.drive_size = drive->partinfo.media_size; 126 #if VINUMDEBUG 127 if (debug & DEBUG_BIGDRIVE) /* pretend we're 100 times as big */ 128 drive->label.drive_size *= 100; 129 #endif 130 131 /* number of sectors available for subdisks */ 132 drive->sectors_available = drive->label.drive_size / DEV_BSIZE - DATASTART; 133 134 /* 135 * Bug in 3.0 as of January 1998: you can open 136 * non-existent slices. They have a length of 0. 137 */ 138 if (drive->label.drive_size < MINVINUMSLICE) { /* too small to worry about */ 139 set_drive_state(drive->driveno, drive_down, setstate_force); 140 drive->lasterror = ENOSPC; 141 return ENOSPC; 142 } 143 drive->freelist_size = INITIAL_DRIVE_FREELIST; /* initial number of entries */ 144 drive->freelist = (struct drive_freelist *) 145 Malloc(INITIAL_DRIVE_FREELIST * sizeof(struct drive_freelist)); 146 if (drive->freelist == NULL) /* can't malloc, dammit */ 147 return ENOSPC; 148 drive->freelist_entries = 1; /* just (almost) the complete drive */ 149 drive->freelist[0].offset = DATASTART; /* starts here */ 150 drive->freelist[0].sectors = (drive->label.drive_size >> DEV_BSHIFT) - DATASTART; /* and it's this long */ 151 if (drive->label.name[0] != '\0') /* got a name */ 152 set_drive_state(drive->driveno, drive_up, setstate_force); /* our drive is accessible */ 153 else /* we know about it, but that's all */ 154 drive->state = drive_referenced; 155 return 0; 156 } 157 158 /* 159 * Initialize a drive: open the device and add device 160 * information 161 */ 162 int 163 init_drive(struct drive *drive, int verbose) 164 { 165 if (drive->devicename[0] != '/') { 166 drive->lasterror = EINVAL; 167 log(LOG_ERR, "vinum: Can't open drive without drive name (%s)\n", 168 drive->devicename); 169 return EINVAL; 170 } 171 drive->lasterror = open_drive(drive, curproc, verbose); /* open the drive */ 172 if (drive->lasterror) 173 return drive->lasterror; 174 175 drive->lasterror = VOP_IOCTL(drive->vp, DIOCGPART, 176 (caddr_t)&drive->partinfo, FREAD|FWRITE, 177 proc0.p_ucred, NULL); 178 if (drive->lasterror) { 179 if (verbose) 180 log(LOG_WARNING, 181 "vinum open_drive %s: Can't get partition information, drive->lasterror %d\n", 182 drive->devicename, 183 drive->lasterror); 184 close_drive(drive); 185 return drive->lasterror; 186 } 187 if (drive->partinfo.fstype != FS_VINUM && 188 !kuuid_is_vinum(&drive->partinfo.fstype_uuid) 189 ) { 190 drive->lasterror = EFTYPE; 191 if (verbose) 192 log(LOG_WARNING, 193 "vinum open_drive %s: Wrong partition type for vinum\n", 194 drive->devicename); 195 close_drive(drive); 196 return EFTYPE; 197 } 198 return set_drive_parms(drive); /* set various odds and ends */ 199 } 200 201 /* Close a drive if it's open. */ 202 void 203 close_drive(struct drive *drive) 204 { 205 LOCKDRIVE(drive); /* keep the daemon out */ 206 if (drive->flags & VF_OPEN) 207 close_locked_drive(drive); /* and close it */ 208 if (drive->state > drive_down) /* if it's up */ 209 drive->state = drive_down; /* make sure it's down */ 210 unlockdrive(drive); 211 } 212 213 /* 214 * Real drive close code, called with drive already locked. 215 * We have also checked that the drive is open. No errors. 216 */ 217 void 218 close_locked_drive(struct drive *drive) 219 { 220 /* 221 * If we can't access the drive, we can't flush 222 * the queues, which spec_close() will try to 223 * do. Get rid of them here first. 224 */ 225 if (drive->vp) { 226 drive->lasterror = vn_close(drive->vp, FREAD|FWRITE, NULL); 227 drive->vp = NULL; 228 } 229 drive->flags &= ~VF_OPEN; 230 } 231 232 /* 233 * Remove drive from the configuration. 234 * Caller must ensure that it isn't active. 235 */ 236 void 237 remove_drive(int driveno) 238 { 239 struct drive *drive = &vinum_conf.drive[driveno]; 240 struct vinum_hdr *vhdr; /* buffer for header */ 241 int error; 242 243 if (drive->state > drive_referenced) { /* real drive */ 244 if (drive->state == drive_up) { 245 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffer */ 246 CHECKALLOC(vhdr, "Can't allocate memory"); 247 error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 248 if (error) 249 drive->lasterror = error; 250 else { 251 vhdr->magic = VINUM_NOMAGIC; /* obliterate the magic, but leave the rest */ 252 write_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 253 } 254 Free(vhdr); 255 } 256 free_drive(drive); /* close it and free resources */ 257 save_config(); /* and save the updated configuration */ 258 } 259 } 260 261 /* 262 * Transfer drive data. Usually called from one of these defines; 263 * #define read_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_READ) 264 * #define write_drive(a, b, c, d) driveio (a, b, c, d, BUF_CMD_WRITE) 265 * 266 * length and offset are in bytes, but must be multiples of sector 267 * size. The function *does not check* for this condition, and 268 * truncates ruthlessly. 269 * Return error number 270 */ 271 int 272 driveio(struct drive *drive, char *buf, size_t length, off_t offset, buf_cmd_t cmd) 273 { 274 int error; 275 struct buf *bp; 276 caddr_t saveaddr; 277 278 error = 0; /* to keep the compiler happy */ 279 while (length) { /* divide into small enough blocks */ 280 int len = umin(length, MAXBSIZE); /* maximum block device transfer is MAXBSIZE */ 281 282 bp = getpbuf_kva(NULL); /* get a buffer header */ 283 KKASSERT(len <= bp->b_bufsize); 284 bp->b_cmd = cmd; 285 bp->b_bio1.bio_offset = offset; /* disk offset */ 286 bp->b_bio1.bio_done = biodone_sync; 287 bp->b_bio1.bio_flags |= BIO_SYNC; 288 saveaddr = bp->b_data; 289 bp->b_data = buf; 290 bp->b_bcount = len; 291 vn_strategy(drive->vp, &bp->b_bio1); 292 error = biowait(&bp->b_bio1, (cmd == BUF_CMD_READ ? "drvrd" : "drvwr")); 293 bp->b_data = saveaddr; 294 bp->b_flags |= B_INVAL | B_AGE; 295 bp->b_flags &= ~B_ERROR; 296 relpbuf(bp, NULL); 297 if (error) 298 break; 299 length -= len; /* update pointers */ 300 buf += len; 301 offset += len; 302 } 303 return error; 304 } 305 306 /* 307 * Check a drive for a vinum header. If found, 308 * update the drive information. We come here 309 * with a partially populated drive structure 310 * which includes the device name. 311 * 312 * Return information on what we found. 313 * 314 * This function is called from two places: check_drive, 315 * which wants to find out whether the drive is a 316 * Vinum drive, and config_drive, which asserts that 317 * it is a vinum drive. In the first case, we don't 318 * print error messages (verbose==0), in the second 319 * we do (verbose==1). 320 */ 321 enum drive_label_info 322 read_drive_label(struct drive *drive, int verbose) 323 { 324 int error; 325 int result; 326 struct vinum_hdr *vhdr; 327 328 error = init_drive(drive, verbose); /* find the drive */ 329 if (error) /* find the drive */ 330 return DL_CANT_OPEN; /* not ours */ 331 332 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* allocate buffers */ 333 CHECKALLOC(vhdr, "Can't allocate memory"); 334 335 drive->state = drive_up; /* be optimistic */ 336 error = read_drive(drive, (void *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 337 if (vhdr->magic == VINUM_MAGIC) { /* ours! */ 338 if (drive->label.name[0] /* we have a name for this drive */ 339 &&(strcmp(drive->label.name, vhdr->label.name))) { /* but it doesn't match the real name */ 340 drive->lasterror = EINVAL; 341 result = DL_WRONG_DRIVE; /* it's the wrong drive */ 342 drive->state = drive_unallocated; /* put it back, it's not ours */ 343 } else 344 result = DL_OURS; 345 /* 346 * We copy the drive anyway so that we have 347 * the correct name in the drive info. This 348 * may not be the name specified 349 */ 350 drive->label = vhdr->label; /* put in the label information */ 351 } else if (vhdr->magic == VINUM_NOMAGIC) /* was ours, but we gave it away */ 352 result = DL_DELETED_LABEL; /* and return the info */ 353 else 354 result = DL_NOT_OURS; /* we could have it, but we don't yet */ 355 Free(vhdr); /* that's all. */ 356 return result; 357 } 358 359 /* 360 * Check a drive for a vinum header. If found, 361 * read configuration information from the drive and 362 * incorporate the data into the configuration. 363 * 364 * Return drive number. 365 */ 366 struct drive * 367 check_drive(char *devicename) 368 { 369 int driveno; 370 int i; 371 struct drive *drive; 372 373 driveno = find_drive_by_dev(devicename, 1); /* if entry doesn't exist, create it */ 374 drive = &vinum_conf.drive[driveno]; /* and get a pointer */ 375 376 if (read_drive_label(drive, 0) == DL_OURS) { /* one of ours */ 377 for (i = 0; i < vinum_conf.drives_allocated; i++) { /* see if the name already exists */ 378 if ((i != driveno) /* not this drive */ 379 &&(DRIVE[i].state != drive_unallocated) /* and it's allocated */ 380 &&(strcmp(DRIVE[i].label.name, 381 DRIVE[driveno].label.name) == 0)) { /* and it has the same name */ 382 struct drive *mydrive = &DRIVE[i]; 383 384 if (mydrive->devicename[0] == '/') { /* we know a device name for it */ 385 /* 386 * set an error, but don't take the 387 * drive down: that would cause unneeded 388 * error messages. 389 */ 390 drive->lasterror = EEXIST; 391 break; 392 } else { /* it's just a place holder, */ 393 int sdno; 394 395 for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* look at each subdisk */ 396 if ((SD[sdno].driveno == i) /* it's pointing to this one, */ 397 &&(SD[sdno].state != sd_unallocated)) { /* and it's a real subdisk */ 398 SD[sdno].driveno = drive->driveno; /* point to the one we found */ 399 update_sd_state(sdno); /* and update its state */ 400 } 401 } 402 bzero(mydrive, sizeof(struct drive)); /* don't deallocate it, just remove it */ 403 } 404 } 405 } 406 } else { 407 if (drive->lasterror == 0) 408 drive->lasterror = ENODEV; 409 close_drive(drive); 410 drive->state = drive_down; 411 } 412 return drive; 413 } 414 415 static char * 416 sappend(char *txt, char *s) 417 { 418 while ((*s++ = *txt++) != 0); 419 return s - 1; 420 } 421 422 void 423 format_config(char *config, int len) 424 { 425 int i; 426 int j; 427 char *s = config; 428 char *configend = &config[len]; 429 430 bzero(config, len); 431 432 /* First write the volume configuration */ 433 for (i = 0; i < vinum_conf.volumes_allocated; i++) { 434 struct volume *vol; 435 436 vol = &vinum_conf.volume[i]; 437 if ((vol->state > volume_uninit) 438 && (vol->name[0] != '\0')) { /* paranoia */ 439 ksnprintf(s, 440 configend - s, 441 "volume %s state %s", 442 vol->name, 443 volume_state(vol->state)); 444 while (*s) 445 s++; /* find the end */ 446 if (vol->preferred_plex >= 0) /* preferences, */ 447 ksnprintf(s, 448 configend - s, 449 " readpol prefer %s", 450 vinum_conf.plex[vol->preferred_plex].name); 451 while (*s) 452 s++; /* find the end */ 453 s = sappend("\n", s); 454 } 455 } 456 457 /* Then the plex configuration */ 458 for (i = 0; i < vinum_conf.plexes_allocated; i++) { 459 struct plex *plex; 460 461 plex = &vinum_conf.plex[i]; 462 if ((plex->state > plex_referenced) 463 && (plex->name[0] != '\0')) { /* paranoia */ 464 ksnprintf(s, 465 configend - s, 466 "plex name %s state %s org %s ", 467 plex->name, 468 plex_state(plex->state), 469 plex_org(plex->organization)); 470 while (*s) 471 s++; /* find the end */ 472 if (isstriped(plex)) { 473 ksnprintf(s, 474 configend - s, 475 "%ds ", 476 (int) plex->stripesize); 477 while (*s) 478 s++; /* find the end */ 479 } 480 if (plex->volno >= 0) /* we have a volume */ 481 ksnprintf(s, 482 configend - s, 483 "vol %s ", 484 vinum_conf.volume[plex->volno].name); 485 while (*s) 486 s++; /* find the end */ 487 for (j = 0; j < plex->subdisks; j++) { 488 ksnprintf(s, 489 configend - s, 490 " sd %s", 491 vinum_conf.sd[plex->sdnos[j]].name); 492 } 493 s = sappend("\n", s); 494 } 495 } 496 497 /* And finally the subdisk configuration */ 498 for (i = 0; i < vinum_conf.subdisks_allocated; i++) { 499 struct sd *sd; 500 char *drivename; 501 502 sd = &SD[i]; 503 if ((sd->state != sd_referenced) 504 && (sd->state != sd_unallocated) 505 && (sd->name[0] != '\0')) { /* paranoia */ 506 drivename = vinum_conf.drive[sd->driveno].label.name; 507 /* 508 * XXX We've seen cases of dead subdisks 509 * which don't have a drive. If we let them 510 * through here, the drive name is null, so 511 * they get the drive named 'plex'. 512 * 513 * This is a breakage limiter, not a fix. 514 */ 515 if (drivename[0] == '\0') 516 drivename = "*invalid*"; 517 ksnprintf(s, 518 configend - s, 519 "sd name %s drive %s plex %s len %llus driveoffset %llus state %s", 520 sd->name, 521 drivename, 522 vinum_conf.plex[sd->plexno].name, 523 (unsigned long long) sd->sectors, 524 (unsigned long long) sd->driveoffset, 525 sd_state(sd->state)); 526 while (*s) 527 s++; /* find the end */ 528 if (sd->plexno >= 0) 529 ksnprintf(s, 530 configend - s, 531 " plexoffset %llds", 532 (long long) sd->plexoffset); 533 else 534 ksnprintf(s, configend - s, " detached"); 535 while (*s) 536 s++; /* find the end */ 537 if (sd->flags & VF_RETRYERRORS) { 538 ksnprintf(s, configend - s, " retryerrors"); 539 while (*s) 540 s++; /* find the end */ 541 } 542 ksnprintf(s, configend - s, " \n"); 543 while (*s) 544 s++; /* find the end */ 545 } 546 } 547 if (s > &config[len - 2]) 548 panic("vinum: configuration data overflow"); 549 } 550 551 /* 552 * issue a save config request to the d�mon. The actual work 553 * is done in process context by daemon_save_config 554 */ 555 void 556 save_config(void) 557 { 558 union daemoninfo di = { .nothing = 0 }; 559 560 queue_daemon_request(daemonrq_saveconfig, di); 561 } 562 563 /* 564 * Write the configuration to all vinum slices. This 565 * is performed by the d�mon only 566 */ 567 void 568 daemon_save_config(void) 569 { 570 int error; 571 int driveno; 572 struct drive *drive; /* point to current drive info */ 573 struct vinum_hdr *vhdr; /* and as header */ 574 char *config; /* point to config data */ 575 int wlabel_on; /* to set writing label on/off */ 576 577 /* don't save the configuration while we're still working on it */ 578 if (vinum_conf.flags & VF_CONFIGURING) 579 return; 580 /* Build a volume header */ 581 vhdr = (struct vinum_hdr *) Malloc(VINUMHEADERLEN); /* get space for the config data */ 582 CHECKALLOC(vhdr, "Can't allocate config data"); 583 vhdr->magic = VINUM_MAGIC; /* magic number */ 584 vhdr->config_length = MAXCONFIG; /* length of following config info */ 585 586 config = Malloc(MAXCONFIG); /* get space for the config data */ 587 CHECKALLOC(config, "Can't allocate config data"); 588 589 format_config(config, MAXCONFIG); 590 error = 0; /* no errors yet */ 591 for (driveno = 0; driveno < vinum_conf.drives_allocated; driveno++) { 592 drive = &vinum_conf.drive[driveno]; /* point to drive */ 593 if (drive->state > drive_referenced) { 594 LOCKDRIVE(drive); /* don't let it change */ 595 596 /* 597 * First, do some drive consistency checks. Some 598 * of these are kludges, others require a process 599 * context and couldn't be done before 600 */ 601 if ((drive->devicename[0] == '\0') 602 || (drive->label.name[0] == '\0')) { 603 unlockdrive(drive); 604 free_drive(drive); /* get rid of it */ 605 break; 606 } 607 if (((drive->flags & VF_OPEN) == 0) /* drive not open */ 608 &&(drive->state > drive_down)) { /* and it thinks it's not down */ 609 unlockdrive(drive); 610 set_drive_state(driveno, drive_down, setstate_force); /* tell it what's what */ 611 continue; 612 } 613 if ((drive->state == drive_down) /* it's down */ 614 &&(drive->flags & VF_OPEN)) { /* but open, */ 615 unlockdrive(drive); 616 close_drive(drive); /* close it */ 617 } else if (drive->state > drive_down) { 618 getmicrotime(&drive->label.last_update); /* time of last update is now */ 619 bcopy((char *) &drive->label, /* and the label info from the drive structure */ 620 (char *) &vhdr->label, 621 sizeof(vhdr->label)); 622 if ((drive->state != drive_unallocated) 623 && (drive->state != drive_referenced)) { /* and it's a real drive */ 624 wlabel_on = 1; /* enable writing the label */ 625 error = 0; 626 #if 1 627 error = VOP_IOCTL(drive->vp, DIOCWLABEL, 628 (caddr_t)&wlabel_on, FREAD|FWRITE, 629 proc0.p_ucred, NULL); 630 #endif 631 if (error == 0) 632 error = write_drive(drive, (char *) vhdr, VINUMHEADERLEN, VINUM_LABEL_OFFSET); 633 if (error == 0) 634 error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET); /* first config copy */ 635 if (error == 0) 636 error = write_drive(drive, config, MAXCONFIG, VINUM_CONFIG_OFFSET + MAXCONFIG); /* second copy */ 637 wlabel_on = 0; /* enable writing the label */ 638 #if 1 639 if (error == 0) { 640 error = VOP_IOCTL(drive->vp, DIOCWLABEL, 641 (caddr_t)&wlabel_on, FREAD|FWRITE, 642 proc0.p_ucred, NULL); 643 } 644 #endif 645 unlockdrive(drive); 646 if (error) { 647 log(LOG_ERR, 648 "vinum: Can't write config to %s, error %d\n", 649 drive->devicename, 650 error); 651 set_drive_state(drive->driveno, drive_down, setstate_force); 652 } 653 } 654 } else /* not worth looking at, */ 655 unlockdrive(drive); /* just unlock it again */ 656 } 657 } 658 Free(vhdr); 659 Free(config); 660 } 661 662 /* Look at all disks on the system for vinum slices */ 663 int 664 vinum_scandisk(char *devicename[], int drives) 665 { 666 struct drive *volatile drive; 667 volatile int driveno; 668 volatile int gooddrives; /* number of usable drives found */ 669 int firsttime; /* set if we have never configured before */ 670 int error; 671 char *config_text; /* read the config info from disk into here */ 672 char *volatile cptr; /* pointer into config information */ 673 char *eptr; /* end pointer into config information */ 674 char *config_line; /* copy the config line to */ 675 volatile int status; 676 int *volatile drivelist; /* list of drive indices */ 677 #define DRIVENAMELEN 64 678 #define DRIVEPARTS 35 /* max partitions per drive, excluding c */ 679 char partname[DRIVENAMELEN]; /* for creating partition names */ 680 681 status = 0; /* success indication */ 682 vinum_conf.flags |= VF_READING_CONFIG; /* reading config from disk */ 683 684 gooddrives = 0; /* number of usable drives found */ 685 firsttime = vinum_conf.drives_used == 0; /* are we a virgin? */ 686 687 /* allocate a drive pointer list */ 688 drivelist = (int *) Malloc(drives * DRIVEPARTS * sizeof(int)); 689 CHECKALLOC(drivelist, "Can't allocate memory"); 690 error = setjmp(command_fail); /* come back here on error */ 691 if (error) { /* longjmped out */ 692 return error; 693 } 694 695 /* Open all drives and find which was modified most recently */ 696 for (driveno = 0; driveno < drives; driveno++) { 697 char part, has_part = 0; /* UNIX partition */ 698 int slice; 699 int has_slice = -1; 700 char *tmp; 701 702 /* 703 * If the device path contains a slice we do not try to tack on 704 * another slice. If the device path has a partition we only check 705 * that partition. 706 */ 707 if ((tmp = rindex(devicename[driveno], '/')) == NULL) 708 tmp = devicename[driveno]; 709 else 710 tmp++; 711 ksscanf(tmp, "%*[a-z]%*d%*[s]%d%c", &has_slice, &has_part); 712 713 for (slice = 0; slice < MAX_SLICES; slice++) { 714 if (has_slice >= 0 && slice != has_slice) 715 continue; 716 717 for (part = 'a'; part < 'a' + MAXPARTITIONS; part++) { 718 if (part == 'c') 719 continue; 720 if (has_part && part != has_part) 721 continue; 722 if (has_slice >= 0 && has_part) 723 strncpy(partname, devicename[driveno], DRIVENAMELEN); 724 else if (has_slice >= 0) 725 ksnprintf(partname, DRIVENAMELEN, 726 "%s%c", devicename[driveno], part); 727 else 728 ksnprintf(partname, DRIVENAMELEN, 729 "%ss%d%c", devicename[driveno], slice, part); 730 drive = check_drive(partname); /* try to open it */ 731 if ((drive->lasterror != 0) /* didn't work, */ 732 ||(drive->state != drive_up)) 733 free_drive(drive); /* get rid of it */ 734 else if (drive->flags & VF_CONFIGURED) /* already read this config, */ 735 log(LOG_WARNING, 736 "vinum: already read config from %s\n", /* say so */ 737 drive->label.name); 738 else { 739 drivelist[gooddrives] = drive->driveno; /* keep the drive index */ 740 drive->flags &= ~VF_NEWBORN; /* which is no longer newly born */ 741 gooddrives++; 742 } 743 } 744 } 745 } 746 747 if (gooddrives == 0) { 748 if (firsttime) 749 log(LOG_WARNING, "vinum: no drives found\n"); 750 else 751 log(LOG_INFO, "vinum: no additional drives found\n"); 752 return ENOENT; 753 } 754 /* 755 * We now have at least one drive 756 * open. Sort them in order of config time 757 * and merge the config info with what we 758 * have already. 759 */ 760 kqsort(drivelist, gooddrives, sizeof(int), drivecmp); 761 config_text = (char *) Malloc(MAXCONFIG * 2); /* allocate buffers */ 762 CHECKALLOC(config_text, "Can't allocate memory"); 763 config_line = (char *) Malloc(MAXCONFIGLINE * 2); /* allocate buffers */ 764 CHECKALLOC(config_line, "Can't allocate memory"); 765 for (driveno = 0; driveno < gooddrives; driveno++) { /* now include the config */ 766 drive = &DRIVE[drivelist[driveno]]; /* point to the drive */ 767 768 if (firsttime && (driveno == 0)) /* we've never configured before, */ 769 log(LOG_INFO, "vinum: reading configuration from %s\n", drive->devicename); 770 else 771 log(LOG_INFO, "vinum: updating configuration from %s\n", drive->devicename); 772 773 if (drive->state == drive_up) 774 /* Read in both copies of the configuration information */ 775 error = read_drive(drive, config_text, MAXCONFIG * 2, VINUM_CONFIG_OFFSET); 776 else { 777 error = EIO; 778 kprintf("vinum_scandisk: %s is %s\n", drive->devicename, drive_state(drive->state)); 779 } 780 781 if (error != 0) { 782 log(LOG_ERR, "vinum: Can't read device %s, error %d\n", drive->devicename, error); 783 free_drive(drive); /* give it back */ 784 status = error; 785 } 786 /* 787 * At this point, check that the two copies 788 * are the same, and do something useful if 789 * not. In particular, consider which is 790 * newer, and what this means for the 791 * integrity of the data on the drive. 792 */ 793 else { 794 vinum_conf.drives_used++; /* another drive in use */ 795 /* Parse the configuration, and add it to the global configuration */ 796 for (cptr = config_text; *cptr != '\0';) { /* love this style(9) */ 797 volatile int parse_status; /* return value from parse_config */ 798 799 for (eptr = config_line; (*cptr != '\n') && (*cptr != '\0');) /* until the end of the line */ 800 *eptr++ = *cptr++; 801 *eptr = '\0'; /* and delimit */ 802 if (setjmp(command_fail) == 0) { /* come back here on error and continue */ 803 parse_status = parse_config(config_line, &keyword_set, 1); /* parse the config line */ 804 if (parse_status < 0) { /* error in config */ 805 /* 806 * This config should have been parsed in user 807 * space. If we run into problems here, something 808 * serious is afoot. Complain and let the user 809 * snarf the config to see what's wrong. 810 */ 811 log(LOG_ERR, 812 "vinum: Config error on %s, aborting integration\n", 813 drive->devicename); 814 free_drive(drive); /* give it back */ 815 status = EINVAL; 816 } 817 } 818 while (*cptr == '\n') 819 cptr++; /* skip to next line */ 820 } 821 } 822 drive->flags |= VF_CONFIGURED; /* read this drive's configuration */ 823 } 824 825 Free(config_line); 826 Free(config_text); 827 Free(drivelist); 828 vinum_conf.flags &= ~VF_READING_CONFIG; /* no longer reading from disk */ 829 if (status != 0) 830 kprintf("vinum: couldn't read configuration"); 831 else 832 updateconfig(VF_READING_CONFIG); /* update from disk config */ 833 return status; 834 } 835 836 /* 837 * Compare the modification dates of the drives, for qsort. 838 * Return 1 if a < b, 0 if a == b, 01 if a > b: in other 839 * words, sort backwards. 840 */ 841 static int 842 drivecmp(const void *va, const void *vb) 843 { 844 const struct drive *a = &DRIVE[*(const int *) va]; 845 const struct drive *b = &DRIVE[*(const int *) vb]; 846 847 if ((a->label.last_update.tv_sec == b->label.last_update.tv_sec) 848 && (a->label.last_update.tv_usec == b->label.last_update.tv_usec)) 849 return 0; 850 else if ((a->label.last_update.tv_sec > b->label.last_update.tv_sec) 851 || ((a->label.last_update.tv_sec == b->label.last_update.tv_sec) 852 && (a->label.last_update.tv_usec > b->label.last_update.tv_usec))) 853 return -1; 854 else 855 return 1; 856 } 857